Evidence for gibberellin-like substances in phloem exudate of higher plants |
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| Authors: | G V Hoad M R Bowen |
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| Institution: | (1) Botany Department, University College of Wales, Aberystwyth;(2) Dept. of Agriculture and Horticulture Research Station, University of Bristol, Long Ashton, Bristol, UK |
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| Abstract: | Summary Samples of sieve-tube sap were obtained as honeydew from aphids feeding on three species of higher plants. The honeydew was extracted, chromatographed and tested in several bioassays for the presence of gibberellin-like substances. The bioassay results indicated that gibberellin-like substances were translocated in the phloem of dandelion (Taraxacum officinale), broad bean (Vicia faba) and willow (Salix viminalis). Results obtained with willow showed that the concentration of gibberellin-like substances in the sieve-tube sap is daylength dependent, high levels being present in plants maintained under long days and low levels in short day plants. |
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